Initialize LLVM time trace profiler on each code generation thread #90617
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In https://reviews.llvm.org/D71059 LLVM 11, the time trace profiler was extended to support multiple threads. `timeTraceProfilerInitialize` creates a thread local profiler instance. When a thread finishes `timeTraceProfilerFinishThread` moves a thread local instance into a global collection of instances. Finally when all codegen work is complete `timeTraceProfilerWrite` writes data from the current thread local instance and the instances in global collection of instances. Previously, the profiler was intialized on a single thread only. Since this thread performs no code generation on its own, the resulting profile was empty. Update LLVM codegen to initialize & finish time trace profiler on each code generation thread.
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wesleywiser
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Thanks! @bors r+ |
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📌 Commit 5a09e12 has been approved by |
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☀️ Test successful - checks-actions |
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Finished benchmarking commit (3cd3bbe): comparison url. Summary: This benchmark run did not return any relevant changes. If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf. @rustbot label: -perf-regression |
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In https://reviews.llvm.org/D71059 LLVM 11, the time trace profiler was
extended to support multiple threads.
timeTraceProfilerInitializecreates a thread local profiler instance.When a thread finishes
timeTraceProfilerFinishThreadmoves a threadlocal instance into a global collection of instances. Finally when all
codegen work is complete
timeTraceProfilerWritewrites data from thecurrent thread local instance and the instances in global collection
of instances.
Previously, the profiler was intialized on a single thread only. Since
this thread performs no code generation on its own, the resulting
profile was empty.
Update LLVM codegen to initialize & finish time trace profiler on each
code generation thread.
cc @tmandry
r? @wesleywiser